visualguy @hf wrote the 727 is better than the 323S for the 009 (take that as you will)
I did not hear the 007 with something better than a 717 and DA11 as source but I felt that the 009 sounded much much nicer (with none of the "veil" that I heard on the 007, I was less impressed with them after hearing the 009) so I would take the latter for its open and super-detailed and clear presentation (it is like an open window to the music while the 007 is a blurred window) but there are genres where the the 007 is more fun because there is more bass. I didn't feel there were issues with the treble either, it was very relaxing to listen to.
Also, for me the fit is nicer on the 009 and because of that the comfort is better as well. If I had to criticize something it would the arc which should not look weird on a hp as expensive as this but the weight is well-distributed.
Now I start to think I would like the HE60 more than an O2 but the former is quite worrying in terms of build quality (reliability)...